Hopefully it's temporary and will be back to normal soon.
Insofar as future preventive measures, who knows if it hit the lid or maybe the center brace; so just as a bit of extra precaution you might think about putting some yoga mat or similar around that brace. Blocks out a bit of light but I'm ok with that, Aros don't need to be staring up at full-on lighting all the time.
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Also instead of a hard lid I opted for using this strong plastic mesh riveted into aluminum siding pieces for this DIY lid -- it's kinda light in weight but can be secured strongly by properly adjusted bungy cords or similar. More evaporation of water I guess, but again a trade-off I prefer for a bit more safety and peace of mind.
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Hope your beauty recovers soon!