HTML bold code works for one string but not the other?

I am using the HTML bold code to modify text in a string variable that is then attached to an HTML editor for display.  In one line of the code it works beautiful but in another it does not.  Can someone point me in the right direction?

int i = 0;

                foreach (var rsdatarec in RXresult)
                {

                    rxarray[i] = rsdatarec.rxdata.RxItemName + "<b>Rx Strength = </b>" + rsdatarec.rxdata.RxStrength + "   <b>Take = </b>" + rsdatarec.rxdata.RxTakeValue + "   <b>Frequency = <b>/" + rsdatarec.rxdata.RxFreq + "   <b>Duration = </b>" + rsdatarec.rxdata.RxDuration + "   <b>Dispense = </b>" + rsdatarec.rxdata.RxDespenseValue + "   <b>Refills = </b>" + rsdatarec.rxdata.RxRefillsValue;----------<<<<<<<<<-----problem occurs HERE

                    MyGlobalVars.Rx[i] = rxarray[i];

                    i++;

                }


                // Concantenate Rx Array
                int rxindex;
                MyGlobalVars.RxConCat = "<br /><br /><font color=blue><b>Medications</b></font><br />";  -----------<<< works great HERE---

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