We have just had a new bathroom fitter and the plumber hasn’t bolted the WC pan to the floor. There are holes either side of the base of the pan for just that.
It’s possible he’s used sealant, but that’s not a long-term fix, is it? And the holes for the bolts will allow any liquids which run down the outside of the pan to get into the space underneath, won’t they?
I think I need pigletjohn or someone who knows this sort of thing as I feel I’m being fobbed off by “nah, love, we use this stuff to fix it these days”.