What Could Be Causing My Gums To Grow Over My Braces, And Is It Related To My Orthodontic Treatment?

hi I am 18 years old I had my braces on for about 4 years now since 2020 during covid , within a few months of getting my braces I noticed my gums was swelling up on my bottom row teeth now my whole bottom row teeth and also my upper it seems like my gums is growing over my braces . When ever I went to my orthodontist they didn’t say anything about it except to brush twice a day . I always use a waterpik as well . What can be the cause of this ??