You probably already have this taken care of, but have to ask just to cover it..........is the fit adjusted when you use the indoor bike 100% identical to your outdoor bike each time you use it? I mean, within reason. Like, you set it up just right once with a fabric tape measure then know in the future "set the bars up to the 10.5 setting, bars out to 12.2, saddle up to 8.9, saddle back to 7.5" kind of deal.
It's something to be cautious of sharing a bike with another person that's a stationary.
I used to go to the work gym and use a Cycleops stationary trainer before Covid hit and we got booted from that gym. I used a fabric tape the first time to set it up to my fit. Then noted what the little tick marks were at on the stationary to quickly put them there each time I rode it.