but the player only attack's with the first weapon of the multiple weapons equipped..
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Maybe I worded the topic weirdly.
yes, because I think there is something else - could it be that you're using a different battlescript in addition to the equip script?
Because in default, all attacks are completely without weapons, they're stat-based ONLY.
But if you added a script to display a sprite with a weapon, and that battlescript uses only one weapon display during the attack, then that's normal for that script.
However, in that case it is impossible to change that without knowing which script you're using - please link to it.
But without changing the battlesystem, there is no weapon displayed or used during any attack, so in that case your claim that the actor uses only the first weapon is wrong, because in default the attacks have absolutely no direct weapon use.
Or it could be that you're talking about the attack element instead of the attack weapon - because again, with different attack elements as features only one of those elements will be used due to the combination functions of the engine - but in that case, you don't need a script for multiple weapon use, you need a script for multiple element use.
So please describe in detail, what do you interpret as "uses only the first weapon" - what message or what display on the screen lets you assume that?