Fixed Asset Manager Problems

Anyone use fixed asset manager?  I am trying to use it to post book only depreciation and it does not want to calculate correctly.  Trying to schedule a 5 year straight line, full-month convention acquired 5/12/2021.  $25,786.17 should result in a depreciation for May and June of $429.77 each month.  If I select to post 5/1 it says their are no assets.  That would be technically incorrect since the asset was acquired in May and with full-month it should post a may full month depreciation.  But I will let that slide for now.  So I try 5/31 and it wants to post $270ish dollars.  basically the daily amount.  It then appears to run correct each month till end of year when it has to over post to true up.  Am I doing something wrong or does this not work how other software (or paper) does.  I normally would post depreciation on the 1st of every month.