a lot of people use these redundant modifiers like this

you don't need to put -al after -ic because they do the same thing

spatial - because spatic would be confusing and weird

circumstantial - because circumstantic would be weird

somatic - because somatal would sound weird

-al and -ic are both modifiers that turn a noun into an adjective. soma means body and somatic means "of a/the body", space means, you know... and spatial means "of space"

there is some cases where people are using -ical as well, but this is an illusion that the -ic was a noun modifier. magic is an example. you use -al to change it into an adjective because it already ends in -ic.

another one that people often misuse is semantic. semantic is already an adjective, though it is also a noun at the same time, depending on context. you don't often here anyone saying "semantical" because semantic does already work as an adjective, when paired with a noun. and further, "semantics" is the normal way to use the word, because meaning is rarely singular. a bit like how the word semantic itself has two contextual meanings.