Bad layout of straight chordlines ("slides")
When adding a slide-in effect in a tablature, the effect gets drawn in the previous note, because the needed space is not added:
The first number 4 has a "slide in above" effect but that crosses out the previous 5.
The last 5 has a "slide in below" effect that crosses out the previous 4.
The 7 and the last 5 have "slide out" effects, but in this case MuseScore adds automatically the needed space after the note, and nothing gets crossed out.