Retirement deductions

I have three businesses or streams of income and it seem only one stream is used to calculate the maximum amount of my retirement contribution, One is 1099 income from real estate sales, the second is w2 income as a real estate broker for a real estate company, the third is K-1 income from co-ownership of a title company, neither of the two companies company retirement plans just three owners and no full-time employees. I have a self/solo 401K but in the business section of deductions only the income from the 1099 seems to be used. Any suggestions?

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