Credit Rating Drop from Purchasing Rental Properties

[Andrew Pettitt]

I'm a Canadian real estate investor and recently purchased a few rental properties which net positive cashflows.  

• Duplex Side A -  $2,500/month or $30K/year - 2-YR lease set up
• Duplex Side B - $2,500/month or $30K/year - 2-YR lease set up 
• Airbnb - $4K/month or $50K/year (2-YR average) - Nightly Rates

I purchased the duple in November 2019 and just noticed my credit rating dropped the day I made this purchase. Has anyone experienced this before? 

Is there a way to show banks' property revenues to keep credit ratings up? Is this even possible?