AM5728: Baud rate differs between UART's

Part Number:AM5728

Hi,

Both UART1 and UART3 are using the FUNC_48M_CLK.  I am using 0x1a in the baud rate low byte, 0 in the high byte.

UART3 has a bit time of around 8.6 usec, this translates to around 115k baud.  UART1 on the other hand has a bit time of around 8.8 translating to around 113k baud. 

The serial port receiving this data is tolerant of the 115k baud but is not able to handle data at 113k baud.

Why are the two UARTs demonstrating different bit times with the exact same settings?

Thanks

Kevin