I have a blueprint with parameters 0 through 6, where 1 through 6 are the ingredients of 0. all have different default values. Nuclear reactor used as testing recipe.
entering "sign(p1_r-10000)" into one of the formula boxes gives -1.
entering "sign(p6_r-10000)" into another one of the formula boxes gives 0 (as unused parameters apparently have a rocket capacity of 10000).
entering "sign(p1_r-10000)+sign(p6_r-10000)" into a third formula box gives 0. -1+0 does not equal 0 so this is incorrect.
assigning the first two to variables a and b respectively and entering "a+b" into a fourth box gives -1, which is correct.
The blueprint I've been using for testing: 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
[2.0.55] Blueprint parameters not calculating correctly.
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- Burner Inserter
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Re: [2.0.55] Blueprint parameters not calculating correctly.
On my end the variables aren't even being recognized as valid by the formula editor. This happens in blueprints I've used before, but using OP's blueprint, I see:
Re: [2.0.55] Blueprint parameters not calculating correctly.
It gets stranger: despite the formula editor saying my variables are wrong, I can save it, and paste it and it calculates fine. 

Re: [2.0.55] Blueprint parameters not calculating correctly.
Ah looks like my problems are assigned here viewtopic.php?t=128863. OP's issue seems unrelated, my bad.