Hello and Welcome to ‘Ask A Doctor’ service. I have reviewed your query and here is my advice.
Sometimes machines will interpret non significant changes as being significant. Leads positioning over chest wall can make some differences in reading axis changes. During young age, more of Rt axis is normal. Sinus arrhythmia
is almost normal physiological change in heart rate
with inspiration and expiration.
Hope I have answered your query. Let me know if I can assist you further.