Cascading MFB filters
There isn't any loading effect caused by cascading the filter stages but the response won't be what you expect it to be.  The formula for calculating the filter components put the break point at the -3 dB point.  When you cascade the filters, the break point is now at -6 dB.

I had asked a similar question on this site and got a great response.  That question is at tool-to-calculate-cascaded-but-independent-single-pole-rc-hi-pass-filters

You can use that question as a guide to coming up with the appropriate correction factor for your 2nd order filters.