I performed RNA extraction and by Agilent machine I got the RNA quality check ( RINe). In result graph, I have more than 3 sharp peaks (5s, 18 and 28s rRNA peaks) and one more that I do not have any explanation for that.

maybe DNA contamination but I do not know which one could be the DNA contamination peak and why one of the extra peaks is that much sharp and big!!

Could anybody who knows the details, explain me the star labeled (*) parts in the graph?

Thank you in advance for any help.