Values from two lists are not processing correctly within two nested loops

I am trying to pass some values contained in two lists to a simple echo within two nested for loops (the echo is used to look at what is generated inside the inner loop). But the results are not expected. I sure could use some guidance!

Using the bash shell. Here is the snippet:

---

a_list="0.05 0.10"
b_list="120.0 130.0"
c=44
x=555.0
for a in $a_list
do
   for b in $b_list
       do
           echo $x $a $b $c
       done
done

---

I expect this:

555.0 0.05 120.0 44
555.0 0.05 130.0 44
555.0 0.10 120.0 44
555.0 0.10 130.0 44

but I get this:

555.0 0.05 120.0 44
 44.0 0.05 130.0
555.0 0.10 120.0 44
 44.0 0.10 130.0

The 2nd and 4th lines are wrong. The 44 appears to echo first and overwrite the 555.0 . If I load the values of the lists directly into the for loop, it works OK. Like this:

---

c=44
x=555.0
for a in 0.05 0.10
do
   for b in 120.0 130.0
       do
           echo $x $a $b $c
       done
done

Thanks for any help and insights!