Road bends broken, rendering artifacts

[omeckman]

Hi everyone,

first of all, sorry if i'm in the wrong project or missed something, but for me at the moment, my problem seems to be specific to OTM.

I have a local OSM installation and want to create a huge map for DIN A0 printing. So far i used hm-render-mapnik and some customization and the standard openstreetmap-carto project.
I now installed OTM and got it to render, first with gaps in the darker parts of the hillshades, which i could resolve with using lzw instead of jpeg compression, but i still have this problem:

Roads are not correctly connected/have holes/gaps at bends, sometimes the borders of roads are missing, or the thickness of roads varies without transition.

I'm not sure if this has to do with elevation/contour data, i played around with different dpi settings and stroke-linejoin, stroke-miterlimit and whatnot, but no difference.

Here's how it looks like compared to the original openstreetmap-carto style:

Thank You for any hint to where i need to look to fix this.