My code is as below

Code:
reghdfe wNET_PRO_MAR pt , a(TYPE2 yr)
est sto m1


reghdfe wNET_PRO_MAR pt wFIRM_SIZE LNGDP UNEMPLOYMENT IMP_OVER_GDP INFLATION wLEVERAGE , a(TYPE2 yr)
est sto m2


reghdfe wNET_PRO_MAR pt wFIRM_SIZE LNGDP UNEMPLOYMENT IMP_OVER_GDP INFLATION wLEVERAGE median_mtbv Herfindahl , a(TYPE2 yr)
est sto m3

esttab m1 m2 m3 ,star(* 0.1 ** 0.05 *** 0.01) ar2 label title(" **wNET_PRO_MAR -reghdfe** ") mtitle("w/o contr" "f&c_contr" "ind_contr" "ind*year_fe" "reg*year_fe" "non_US firms") keep(pt wFIRM_SIZE LNGDP UNEMPLOYMENT IMP_OVER_GDP INFLATION wLEVERAGE median_mtbv Herfindahl)

The result is like that

Array

As can be seen that the appearance of the variables is quite strange, can I ask how to deal with this problem. Thank you in advance.