water under vinyl flooring from shower

https://moldremediationstlouisdigest.ironwoodscope.com/posts/when-shower-water-seeps-under-vinyl-flooring-a-mold-remediation-st.-louis-case-study

That wet, squishy feeling underfoot by the shower is never a good sign. Water from your daily showers has been seeping past the vinyl's edge, probably through a gap in the caulk or where the floor meets the wall. Now it's trapped between the flooring and the subfloor, creating a perfect environment for mold and potential rot. You can hear it slosh slightly when you step, and the vinyl feels loose in spots.