Problem in SpamAssassin. Spam email messages are not get ***SPAM*** sign in the title

Server Config
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Hi guys, i just realize when i still using previously server, most spam email messages are get spam sign like SPAM in the title

but after using current server, we never see any email messages with that sign in the title again. Still some spam email messages, dont have that sign in the title

i check in WHM >> Exim Configuration Editor >> Filters >> ‘SpamAssassin™: X-Spam-Subject/Subject header prefix for spam emails’, its already set to SPAM, i dont understand its never working

screenshot

I already check too in cpanel >> then go to SpamAssassin™ menu
its says SpamAssassin is currently Enabled

screenshot

please help guys, i want set the Spam email messages are get SPAM sign in the title

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please help anyone if you have information please share it

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please help anyone if you have information please share it, why spam email messages are not get spam sign like SPAM in the title

here are the full screenshot from WHM >> Exim Configuration Editor >> Filters

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