Is it possible my mochi have gone bad in the heat?

I've had these mochi in my cupboard for a few weeks, they are all individually sealed and well within date, but I just had 2 now and the texture seemed off. Not as chewy as they used to be and some oils had split out of the fillings. I know that normally there's no need to refrigerate this type of mochi and it lasts a long time but where I live it's been insanely hot for the past weeks and we have no AC, so our kitchen and cupboards have probably been getting up to between 25°c and 30°c (even higher on the worst days) very regularly. Could this mean they're bo good now?