I understand what なぜか and こういうのって mean in a rough sense, but I'm having a hard
time grasping the meaning well enough to make a sentence out of it while
translating something.

The context is that Person A just realized that Person B might not understand
the language he is speaking.

[Page 1](https://i.stack.imgur.com/cDOD8.jpg)

[Page 2](https://i.stack.imgur.com/i0nqf.jpg)
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question
translation meaning
Help with understanding なんだかこういうのって
The phrase 「ああそっか なんだかこういうのって」 would need to be translated in conjunction with
the hand-written 「てれっ = "I feel bashful/flattered/awkward"」, which is used
almost like a sound effect or onomatopoeia here though it is originally the
colloquial way of saying [照]{て}れる.

The little guy senses the satisfaction on the part of the big guy, which in
return gives him a sense of achievement and positive awkwardness.

As in many other cases of J-to-E translations, one would have to use a few
words that are not in the original for it to make sense in the target
language. My own TL attempt might be something like:

"Never knew something like this would feel so awkward."
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answer