Could not union geometry correctly

i am trying to set the geometry using the geometry tab my geometry is like this, basically it’s just a combination of two cylinders:
image
but when i tried to union them, the geometry became like this
image
I have tried multiple times but still cannot resolve this

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Please make sure the cylinders are closed (add caps at both ends).

HI, thanks for your reply, i just checked and from what i have seen the cylinders are both closed but i still could not get right geometry, i have attached the zip file, could you please have a look?

Thanks~
4_2023-04-04T202312.667679.zip (16.4 KB)

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I am not sure what is going on. I tried to sample the implicits but it didn’t help. My recommendation is to use the procedural cylinders instead.