Stata's "ivregress 2sls" command - generating F-stats to test for weak instrument

I am transitioning to using the "ivregress 2sls" command in Stata for IV estimates. I’ve been trying to produce F-statistics to test for whether the instrument is weak. I believe that the key is, after running the following:

ivregress 2sls haz (event12 = distanceToBorder) sex age m_age m_everschool ///
 nightLights13 UR windex5  no_hhmembers hh_head_sex i.language , vce(cluster cluster_number)

You then call on the estat command as follows:

 estat firststage

But for my estimation, this produces F-stats that are suspiciously high (like 500+). Am I missing something?