My outlet has the horizontal line, so should be 20Amp, no ? Still the breaker that controls it (the one written Fridge/Oven on it) is 15 Amp. Am I missing something ? Did they install the wrong outlet ?
You are correct that is a 20 amp GFCI receptacle but the breaker may not be for that fridge.
Residential requires 2 20 amp small appliance branch circuits this has been code for many decades.
Prior to GFCI requirements for the kitchen counter top circuits called small appliance branch circuits it was common to power the fridge from this circuit.
It became a common thing to put a GFCI receptacle at the first receptacle to provide GFCI protection for that branch circuit.
It is possible the “fridge” 15 amp breaker is for another device.
If the 15 amp breaker actually controls that receptacle a correction needs to be made a 15 amp receptacle to match the breaker.
(You can have 2 or more 15 amp receptacles on a 20 amp breaker but not a 20 amp receptacle on a 15 amp breaker).
It may be possible the wiring is 12 awg, if 12awg wire it may be cheaper to replace the 15 amp breaker with a 20amp.