Disappearing vertical scroll bar

I seem to always lose the right-hand vertical scroll bar - or rather, it disappears. I believe this happens both in the SYSTM software and on the systm.wahoofitness website. I am not sure why, and I think this happened to me even with the SUF software. I am a Win10 user with Firefox primarily. Closing/restarting solves this. Does anyone else have this issue?

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Yup in Chrome

Yeah same happens here in the calendar and when the vids are running