Family declined wedding invitation

Hey y'all, first time poster here. My fiancée and I just sent out invites (sept 12, 2020 wedding) and the RSVPs are slowing trickling in. I obviously expected (and even hope for) a 15-20% decline rate. Out of about 127 so far there are 13 declines, 2 of those which I completely expected. The other 11 are my great aunt and uncle, and their 3 kids (my second cousins) and their respective spouses and kids. I wouldn't say we are super close but we do still get together for holidays a couple times a year and I attended all of my cousins weddings in the last 5 years (even one that was quite inconveniently located). So, it was a little bit shocking to see the entirety of that family group all say they aren't coming. Now of course there is COVID to consider as a reason but when its one entire family that feels a little personal. On one hand its a relief because they just cleared up an entire table at the reception and its less mouths to feed. Nor did I really want all of my second cousins little kids there as there would be 3 under 3 years old. But at the same time I am very curious as to what their reason is. I am a lesbian and that family group are republicans from west Texas and I have a feeling that my lesbian wedding may be the real reason. Which, I mean, is fine as I do not want anybody to attend who does not truly support my marriage. Anyway this is all to ask, should I find a way to ask them why they've decided not to attend or do I just let it be?