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Why ASK Demod signal is incorrectly restored

When I try to demodulate a signal modulated using 4-ASK (using NI Scope and Modulation Toolkit), I get a different signal than I want.

I think the problem with this signal is that the I value exceeds 1 when demodulated using the API.

What could be causing this problem? Where am I doing wrong?
The processing process from the received signal is left as a snippet.

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