Strange peaks in OFDM signal

Hello,
I’m trying to transmit random data using OFDM system but I have strange
problem. Like you can see on the picture I attached, there is quite high
peak in the frequency spectrum (in the red rectangle). I am using OFDM
example from gr-digital with some changes in options, flow graph
screenshots are also attached. Any idea how can I get rid of this peak?
Thanks!

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