Yes, it’s very weird. We have a quite orthodox pastor who observes liturgically correct Masses. Now our music is some OCP folk dreck but some traditional hymns as well. But we invariably get a round of applause after each and every Mass. Several years ago, on Ash Wednesday, I approached the pastor to see if he could help me put an end to it. I explained that it made me, as a choir member, feel very uncomfortable because I was not putting on a performance to be applauded. But he explained that it is just the assembly expressing their joy and thanksgiving to God and he would not be discouraging it. So I have to put up with it.
In my visiting parish, the applause only happens when the CEOs are there (Christmas-and-Easter-Onlys).