Appears to me your bulbs heat are melting the lense!Anyone else notice their third brake like looking like this. I don’t remember it having those “dents”. They seem exactly the same so kinda weird if not original
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Its not the tint. Its cheap plastic. Seen this on all years rangers. Switch to LED and your done.Most likely caused from the heat of the incandescent bulbs being retained by the tint. The plastic lens is most likely polycarbonate and that plastic starts to soften around 150°C.
Either lessen the amount of tint and/or switch to LED bulbs.