The /usr/lib/gstreamer-1.0/libgstmpg123.so: undefined symbol: mpg123_param2 problem might be a fixable repo dependency problem, but it seems to be safer to ignore the repos with gstreamer-1.18.5 for now. 
What are the benefits of installing gstreamer-1.18.5 from openrepos? What apps could pull it? I don’t remember installing it directly.