Hello,
Normally addresses are not refreshed on every reload, but stored in the DB and reused (table: wp_wallets_adds). You can then manually ask to refresh addresses. So you could check the table to see if addresses are being saved in it. This table normally holds an association of user_ids and coins to deposit addresses.
If addresses refresh on every reload, this could indicate that they are not saved on that table, due to some DB problem. The table requires some non-standard features (latin1 encoding). This could be damaged, for example, if you have exported the table from another machine and imported the SQL manually into your current installation. (see also the discussion here).
Could you please show me the result of DESCRIBE wp_wallets_adds on your MySQL console (replacing wp_ with your default DB prefix if needed)?
Additionally, there could be some related error in your mysql error.log file. This would indicate that addresses are not inserted. If you could spot such an error it would be very helpful for determining the root cause of the problem.
with regards