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Hello. How are you doing? I'll be happy to assist you. Do you have any pictures you can share?
Thank you for the photo. I'm looking at it now.
The squash blocks are important and need to be addressed or you can have a web crippling/buckling failure of the wood I-joist(s). As far as the bowing, all members will deflect under any load, it's just a matter of making sure that the deflection is within limits that are acceptable for the type of floor finish you have. Do you know how much it's deflected and what the span is?