Hi Gregarth and welcome to the forum:
Nope, so such experience. However, given you think you might have inadvertently changed something, your best course of action is to do a factory reset of the camera, as per P938 of the Advanced User Manual, which you can find At This Link .
While shooting with my R3 in TV mode tonight, I somehow hit something and now the shutter speeds are like 1/1217.7 and I have no idea what I hit or how to take it off. Has anyone else experienced this?
Would you happen to be shooting indoors when it happens? I believe the R3 is one of the few camera that can automatically micro-adjust its shutter speed to best compensate for light flicker.
…from the Advanced User Manual. Notice the shutter speed being displayed.
High Frequency Anti-Flicker once enabled can be set to Automatic or Manual, where it will prompt you before it micro-adjusts shutter speed.
While I have the R5 instead of the R3, I hope some of this might be helpful.
You did not mention how you are viewing the shutter speed. The shutter speed is recorded in more than one place in the exif data. Also, in some cases it is recorded as a ratio and rounded for display by some programs but not by others. Also, some values are represented by binary scaled integers and displayed as fractions. 1/64 might be stored as the binary value 00000001 and scaled by 10000000. 1/60 scaled by 256 would be 4.266666666666666496 in decimal while 1/64 scaled by 256 would be 4.0 in decimal.
One recent image from my camera has the following in the metadata of the CR3 file:
I used this command line to obtain the information:
exiftool -G0:2 -U IMG_0729.CR3
Also, I found this paragraph in the camera manual:
"To coordinate exposure compensation in ½-stop increments with ISO speed set in ⅓-stop increments when [ : Exposure level increments] is set to [1/2-stop] and used with ISO Auto, exposure compensation is further adjusted by adjusting shutter speed. However, the shutter speed displayed will not change."