I know its probably got something to do with EIGRP no auto-summary, I was wondering if I could get some input as to why a route would change from being variably subnetted, which is usually the case until no auto-summary is deployed. Or am I totally lost? I attached a screen shot for a closer observation.

A network is listed as subnetted if all subnets within the classful network are the same size. A variably subneted network is one where there are difference sized subnets. In your screenshot above, all subnets within the classful 10.0.0.0 network are /24, but the subnets within the 172.16.0.0 classful network are different sizes (/24 and /16). This is why it appears to be linked to auto summarisation within EIGRP - auto on and networks are advertised as classful networks; no auto and networks are advertised as their 'actual' subnets