Test strips aren't accurate. Need a little help with it.

So I haven't checked my Bettas' water parameters for quite some time now. Everything seems accurate except the hardness and I need someone with great eyes to help me with it. i can't tell if this is normal. The parameters did get bigger numbers over time. So what I see is: nitrate: 0 nitrite: 0 (can't tell what the hardness is) Alkalinity: 80 and pH: 7.2. sorry if the photos are bad. Just out of curiosity, can traveling in the warmth for a few days ruin the strips? I live in Texas and bought these when it was super hot out. Took 2 days to get here.