GTS SDI II IP Core not producing correct tx_vid_clkout frequency

I'm using an Agelix 5 (the Altera development board) with Quartus Pro 25.3.1 w/patch 1.02.

i'm trying to set-up the GTS SDI II IP Core (version 2.3.0)

on the Main screen, the only configurable values are:

• Video Standard = HD-SDI
• Direction = Transmitter
• Insert payload ID = off
• SDI_II wrapper = Both BASE and PHY

everything else is grayed out.

I have connected the tx_pll_refclk to the 148.5MHz input.   I do see the tx_pll_locked signal behave as expected and it does lock.

the problem is when I look at the tx_vid_clkout signal its 58.3MHz.  I expected it to be 74.25MHz.

I'm somewhat confused as to whether tx_pll_refclk should be 148.5MHz or 74.25MHz, but if the 148.5 is wrong then I would have expected tx_vid_clkout to be twice, not a somewhat random value of 58.3MHz.

when I reconfigured the IP core for 3G-SDI, the tx_vid_clkout frequency doubled to 116MHz.  The doubling would be what I expected, but still a wrong frequency.

i'm not sure what i'm setting wrong and why i'm getting a clkout of 58.3MHz