Data in the rewards table of my node don't show the same values as in my Yoroi Wallet or on PoolTool

i’m running a node and also db-sync (on mainnet). The node aswell as db-sync are full synced.
When i query the rewards table for a specific stake address i receive all the expected rewards entries. If i compare the amount of the result with the amount displayed in my yoroi wallet or also on i have small difference of around 0.0128% starting with epoch 235 (the amount in my tables are lower).
Is there something i have to take into account in addition of the rewards table starting with epoch 235?
Thanks very much for your help!
Kind regards Thomas