Formula not saving correctly

Hello,
I am using this formula to pull numbers based on a name in excel:

=SUM(SUMIF($D2:$D107,{"AR"},H2:H107))

This works fine for what I need it to do; however, when saving it and returning to it the next day, the formula changes to:

=SUM(SUMIF($D2:$D107,{0},J2:J107))

any reason why the naming get replaced by 0??

Thanks,

Why not use plain =SUMIF($D2:$D107,"AR",H2:H107)) ?
No need for SUM function or brackets