Where is my remaining federal tax refund? I only received a portion from TPG Products SBTPG LLC.

I received $2,918.34 via direct deposit on 4/13/22 from TPG Products SBTPG LLC.  My federal tax refund is $5,426.  Where is the remaining $2,507.74? My family did not receive the 3rd stimulus check. We did not input 0 in Turbo Tax when asked the amount received from stimulus checks.  Can someone please explain/investigate? This is a significant amount of money to be missing and I have not received any correspondence from the IRS, Turbo Tax, or TPG regarding the discrepancy. 

 

Looking forward to a response.