WIZ107SR vs WIZ750SR


We used WIZ107 and now are replacing it with WIZ750.
It wasn’t working properly, we observed with wireshark that the WIZ750 was sending 1 byte per packet so we changed the “Time (ms)” setting in the “Serial data packing condition” section of the configuration tool to 10ms. It solved the problem.
However, please note it was not needed with WIZ107. Can you confirm it is the correct way to solve the problem ?

Besides, as we observed the TCP frame, either with WIZ107 or WIZ750, Wireshark says the TCP frames are malformed.
Can you please tell us more about that ? Please refer to the picture attached.