enquiry about Tx & Rx filters

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Hi all,
I am designing transmitter (for pulse shaping)and recieved filters (as a matched filter) but when i passed the signal through the transmitter filter the signals increases by one symbol and that happens in receiver side. therefore, the received signal is (transmitted signal +2symbols).
I really don't know from where that symbol come. any helps are welcomed.

by the way i'm using FIRRCOS (Raised Cosine FIR Filter)
 

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