nextcord-ext-menus: pagination buttons don't go forwards/backwards

[PearooXD]

My code:

    class ListPaginationLeaderboard(menus.ListPageSource):
        def __init__(self, data, interaction: nextcord.Interaction, client: nextcord.Client):
            self.interaction = interaction
            self.client = client
            super().__init__(data, per_page=10)
    
        def find_lowest_closest_key(self, my_dict: dict, target_value: int):
            sorted_keys = sorted(my_dict, key=lambda x: abs(my_dict[x] - target_value))
            for key in sorted_keys:
                if my_dict[key] >= target_value:
                    return key
            return sorted_keys[-1]

        async def format_page(self, menu, entries):
            if menu.current_page == 0:
                no1 = await self.client.fetch_user(entries[0][0])
                calculation = (levels[entries[0][2]+1]-entries[0][1]) / (levels[entries[0][2]+1]-levels[entries[0][2]])
                progress = int(20-(calculation * 20))
                embed2 = nextcord.Embed(title=f"<a:crown:1093949606741688480> {no1.name}", description=f"{'█' * progress}{'░' * (20-progress)} {int(100-(calculation * 100))}%", colour=entries[0][3])
                embed2.add_field(name="XP", value=str(round(entries[0][1])) + "/" + str(levels[entries[0][2]+1]))
                embed2.add_field(name="Level", value=entries[0][2])
                if no1.avatar: embed2.set_thumbnail(no1.avatar.url)
                tempxp = levels[entries[0][2]+1]-entries[0][1]
                if (str(entries[0][2]+1).startswith("1") and len(str(entries[0][2])) == 1) or str(entries[0][2]+1).startswith("5"):
                    azvagya = "az"
                else:
                    azvagya = "a"
                embed2.set_footer(text=f"{ceil(tempxp)} XP ({ceil(tempxp / 25)} üzenet) kell, hogy elér" + ("je" if not no1.id == self.interaction.user.id else "d") + f" {azvagya} {entries[0][2]+1}. szintet.")
            embed = nextcord.Embed(colour=int("061379", 16))
            for i, entry in enumerate(entries):
                if i == 0 and menu.current_page == 0: continue
                if i == 1 and menu.current_page == 0:
                    countstr = "<a:medal2:1093836492100599891> "
                elif i == 2 and menu.current_page == 0:
                    countstr = "<a:medal3:1093836496248786944> "
                else:
                    countstr = str(i+1) + ". :small_blue_diamond: "
                count = i+i*(menu.current_page+1) if menu.current_page > 0 else i
                user = await self.client.fetch_user(entries[count][0])
                szint = self.find_lowest_closest_key(levels, entry[1])
                őxpittvanmár = f"<:blankemoji:1093580370831745124>Level `{szint}`\n<:blankemoji:1093580370831745124>XP `{round(entry[1])}/{levels[szint]}`"
                if not user.id == self.interaction.user.id:
                    embed.add_field(name=countstr + str(user.name), value=őxpittvanmár, inline=False)
                else:
                    embed.add_field(name=countstr + str(user.name) + " :index_pointing_at_the_viewer:", value=őxpittvanmár, inline=False)
            embed.set_footer(text=f"Page: {menu.current_page + 1}/{self.get_max_pages()}")
            if menu.current_page == 0:
                return [embed2, embed]
            else:
                return embed

    @nextcord.slash_command(guild_ids=cafe, description="Shows the server's top talkers (and your position).")
    async def leaderboard(
        self, 
        interaction
    ):
        res = self.c.execute("SELECT * FROM users ORDER BY xp DESC").fetchall()
        if res:
            pages = menus.ButtonMenuPages(source=self.ListPaginationLeaderboard(res, interaction, self.client), clear_buttons_after=False)
            await pages.start(interaction=interaction, ephemeral=True)
        else:
            return await interaction.response.send_message("No one has talked yet.")