You mentioned that you have been doing this for about a year now. Do you have a new priest or liturgist? This may be their idea to try something new.
If there is a new person involved in the change, they may have come from a parish with a larger congregation. Our parish (1700+ families) does the same on occasion. It depends on who the cantor is. I don’t know if this is the idea of our new pastor or the cantor. But, with 1700+ families there is always someone you don’t know or someone who is new at mass.
If you would like to ask how it got started in your parish, by all means ask, just remember to use a friendly approach.
God’s blessings to you & your parish!