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The word 本子 means "notebook". So by analogy, it is deduced that the measure word for it, must be 本 just like 一本书
But in Chinese learning materials, I see this word coming with the measure word 个.
Is 一本本子 grammatically incorrect? Or it just sounds weird and abnormal?
一本本子 is grammatically correct，but sounds weird，because of redundant.if we use 一本本子，it sounds like a stammer.
Measure words are not restricted to be used on a certain object simply because certain words appear in it or form part of the object.
Though the word "notebook" has the word "book", (书), in it, it is not a book as such but an "article" with which you perform certain tasks with, notably to make written entries.
Thus you don't buy a notebook to read, like a "book", but to do something with it.
An analogy is the word 秘书, (secretary), which has the word 书 in it. You don't call a secretary 一本秘书 simply because the word 书 appears, but 一名秘书
Thus a notebook, 本子, is not functionally treated as a book, but an article for work performance, like any other article. Hence 一个本子
The answer of Wayne Cheah is correct.
I'd like to add a couple of references to Mainland's videos about 一个本子.
Video 1. Teacher says: 对了，一个本子。
Video 2. 这个本子挺可爱...🙂🙁 (in the title and ones in subtitles).
Besides, the measure word used at the following page is always 个:
And in the dictionary《现代汉语词典》the following example sentences can be found (it is never used the measure word 本):
一本本子is correct. 一個本子sounds like what foreign born Chinese, who don't learn proper measure words, would use. Since 個 is a generic measure word, they tend to use it for everything, such as 一個房子,一個汽車,一個鋼琴, etc., instead of 一間(棟)房子,一部汽車,一架鋼琴.
一本本子 is correct, and it is not weird in any way. However, it is preferred to say 一本筆記本子, 一本素描本子,..etc.
I don't want to criticize your learning material without knowing its context, but the correctness of 一個本子 is quite subjective (or objectionable), as 個 is not a common unit classifier for quantifying things like "book(書)", "paper(紙)", "sheet(床單/被子/蚊帳)". So, avoid the use of 一個本子 if it refers to a booklet consisting of blank papers bound together (a notepad/notebook) that is for writing use.
ADD:
However, as noted by others, 一個本子 can be correct when the "本子" refers to 劇本(戲碼), "playbook", a written book for "play". For this case 一個本子 = 一個劇本 and 一本本子 = 一本劇本, all are correct. But again, 一個劇, 一個戲 are questionable, which shall be avoided.
