Bright Triangle sunlit in appearance was visible until tree line blocked view.

We had been out in the gulf for dolphin tour and on the way back to port at dusk I noticed a brightly seemingly perfect triangle to the west. First thought was it was an opening in the clouds but it was extremely bright compared to the surrounding area and seemed clearly in front of a uniform cloud that was blocking the sun, the edges were well defined and equilateral my second though was portal. It just looked very unnatural and suspiciously geometric. I pointed it out to my family and other on the boat and all agreed it looked strange. It didn’t move at all and was visible until the landscape blocked the view as we headed further inland. Photo was taken with an iPhone. It just looked very peculiar and unnatural.
In reviewing my photos just as a write this a year later I am just now noticing an a strange anomaly in a photo taken 15 minutes after the original triangle. Totally different in appearance but disturbing to notice a year after the fact. The second object is circled in blue.