Subnetting, network engineer thinks this is wrong

So, we are having some serious issues with parts of our infrastructure at work, and level 3 network engineer with (top 5 largest server/networking vendor in the world) is telling me that my subnetting is incorrect..

While i do hold a degree in computer engineering, im not a fully fledged network engineer.

I have a range 10.195.45.0/24 split into:
10.195.45.0/26
10.195.45.64/26
10.195.45.128/27
10.195.45.160/27
10.195.45.192/27
10.195.45.224/27

The whitepaper and pre-flight documents state that the system needs to have different subnets for the different networks of the system. They also have an example, but in this example they use /24 ranges (so the third octet is different in each subnet) and he told me that we need to do the same to have real subnets.... There is no mention of there being a limitation to which subnets you can use, or the size of them (of course they have to be large enough to accomodate the hosts in said net..).
My question is, am i wrong? Is my subnetting somehow magical or unorthodox?
I really want to correct my knowledge if i am, so im trying my luck here amongst people who know what they are talking about.
Thanks for any enlightenment you can bring to the matter.