Where do I even start! We live in a two story home with a seldom used upstairs jack and Jill bath with toilet and shower that was recently cleaned. We also have have a standard hot water tank with recirculating pump for hot water. I have been out of town but my husband called one morning and noticed about a cup of water on floor near where lines go upstairs to bath area. More so to toilet area. No signs of leaks upstairs at all. There are slight signs of seepage on down stairs trim and a small, yet not wet area on Sheetrock. After his shower upon my first morning home there was water that soaked a paper towel under downstairs trim. Since, we noticed very low levels of toilet bowl level water upstairs. He rapidly poured in several gallons of water into bowl and also noticed the fill tube was not going into the black cylinder as designed to do which he corrected. There is still slight seepage from toile bowl but nothing compared to before. We have shut off water, upstairs, taken showers downstairs and done trial and error on all faucets upstairs. Could the toilet have been the potential issue or is there is an underlying issue? No water downstairs observed at all since doing the above. Thank you for your input!