In my case this is with the timepicker control following a datepicker control. Screenshot attached.
It does looks like to be a bootstrap-timepicker issue, have you tried to use the latests libs? You may want to create an issue there (referencing this issue). Will close this for now, feel free to reopen / keep me updated on your issue.
chore(timepicker): update email@example.com (cf. #91)