Don’t ignore loose caulk!
In a nutshell, caulk is used in a tub or shower enclosure to keep water from creeping up, under or around the tiles at joints between tile and the tub or shower pan, or on joints where walls meet. Leaky caulk is not to be ignored! I have often seen tiled bathrooms where the two or three bottom rows of tiles were loosened by water which crept up under the tiles from the bottom! The repair can be time-consuming and expensive. And you might not be able to use the enclosure again for a week or more while things “dry out”!