Incongruence between SeasonAlgo chart and IB

[Kuks]

Hi, I don't understand what I do wrong, but if I try to compare what I see on SeasonAlgo and TWS, the two charts don't match.
I mean, I have big discrepancies.
This is a problem because I can't rely on what I consider fundamental to my trade setup.

i was thinking i had put the two legs in the opposite direction, but apart the overall trend, i see different volatility.
Did you have the same issue, and how did you fix it?

Thanks!

[Roman]

If I remember correctly, we were discussing this over email and you had swapped legs in both platforms.

[Kuks]

Yes, TWS suggests a faster way to declare the spread, but at least to me it doesn't work.
When i had a spread i have to to add each leg separately.