monthly adjusted close
Looking at the daily and monthly historical stock data, it appears that the monthly adjusted close data may be incorrect. I would expect that the adjusted close price for the month would be the close price on the last day of the month and would not reflect any adjustment for dividends that happened earlier in that month.
The numbers reported reflect the month's adjusted close as the closing price on the day of the dividend adjusted for the dividend. I'm not sure that this method provides useful info. All the previous months adjusted close should reflect the dividend adjustment, but not the month's close that happens after the dividend.
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c commented
This is observed in FPURX's historical data