Map objects and tokens dissapearing

For my Rogue Trader campaign ("All Tardsmen Party"), for some of the maps items I've placed simply disappear the next day and tokens too. On a map I use to copy and paste tokens out of onto the actual play maps half of my tokens disappeared and the map has nothing on it but tokens. For City B, items all over the city disappear like cargo in warehouses, camera screens in the club, etc. I have the images I use downloaded and they are not corrupted or deleted. Thanks in advance for any help.

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