Today at school I pronounced 行礼 as "xíng lǐ", but my teacher (not native, level intermediate) corrected me and told me my tone is wrong, the right one is "xìng lǐ". This has created some confusion since my tuition teacher (advanced in mandarin) taught me "xíng lǐ". And I also used a translation app and it shows me the same tone my tuition teacher has taught me.
So who should I trust? what is the right tone for 行礼?