It's not always effective but a bit of lsx sometimes is enough to seal a small drip.
Easy to underestimate the pressure that builds up on that joint for a second or two when the toilet is flushed. It's not always enough to rotate them. Are you sure the angle hasn't changed.
Meh zero labour fee as it is me.
Am tempted to turn the seal 180 degrees as I hate dealing with shit.
When I remove the toilet, the seal goes back in the usual undeformed state.