The door fails to latch properly when it is closed.
Shower door hinge noise.
That allows water to escape from the shower enclosure onto the floor.
A squeaky shower door is annoying and can be a hazard.
If you wish to match the hinges to the door color 1 see if they sell hinge kits in your chosen color they account for spacing when they paint to prevent squeaks or 2 take the hinge apart apply a thin coat of oil based paint it will last longer than acrylic and lubricate well.
It is often caused by dirt or rust on the door hinges.
A squeaky noise is a common problem on shower doors.
If the hinge is not fixed the door may not latch properly.
A slippery floor can easily cause you to fall and sustain serious injuries.
More often it means the hinge is dirty rusty or corroded so that the hinge does not move freely.